Meta-analysis of saffron research in Iran and the world
Historically, saffron (Crocus sativus L.) has had a special place in the development of agriculture in Iran. Research on saffron has a long history and is a growing trend in Iran and the world. The interpretation of accumulated knowledge is somehow difficult due to the great volume of research and in some cases the conflicting findings across studies. In the current study, among 640 internal studies and more than 1236 international studies, 288 biodegradable meta-analysis studies in Iran and the world were collected, and analyzed. For all studies, the effect sizes Hedges (g) and the probability (p) with the effect size of 95% confidence interval were calculated. The results showed that the impact of organic fertilizer on the performance of saffron in Iran and the world is significant. By comparing the average effect size obtained for bovine fertilizer, the amount of 40 to 50 t ha-1 is recommended. The effect of chemical fertilizers (nitrogen, phosphorus and potassium and compound NPK) on the performance of saffron is significant. The greatest impact of nitrogen, phosphorus and potash fertilizer on dry weight of saffron observed (NPK) has the most impact on increasing the number of flowers ha-1. The effect of agricultural practices on the performance of saffron in Iran and the world is significant. The best planting method is cluster planting-row. The greatest effect of planting depth, the corm (t ha-1) and daughter corms on weight corm has been achieved, and the weight of corms (g) and the amount of corm (ha t-1) increase the number of daughter corms. Significant effect of irrigation and irrigation studies on number and weight of daughter corms were also observed. Dates of irrigation have a greater impact on the dry weight of saffron and it increased the saffron daughter corm weight. The results of the meta-analysis for safranal, crocin, and picrocrocin of Iran and the world showed an increase due to the volume of production and export of Iranian saffron.
Mokhtari, M., Koocheki, A. and Nassiri-Mahallati, M. (2017). Meta-analysis of saffron research in Iran and the world. Acta Hortic. 1184, 137-144
meta-analysis, saffron, Iran, effect size, publication bias